Cardiological instrument and method



March 3, 1931. A. T. HAYMANET AL 1,794,685

l CARDIOLOG-ICAL INSTRUMENT AND METHOD Filed July 13, 1928 5 Sheets-sheet 1 March 3, 1931. A. T. HAYMAN ET AL 1,794,685

n CARDIOLOGICAL y INSTRUMENT AND METHOD Filed July 15, 1928 5 Sheets-Sheet 2 March 3, 1931. A, T. HAYMAN ET Al. 1,794,685

CARDIOLOGICAL INSTRUMENT AND METHOD A Filed July 1:5, 1928 5 Sheets-Sheet 3 March 3, 1931. A. T, HAYMAN ET AL 1,794,685

CRDIOLOGICAL INSTRUMENT AND METHOD Filed July 13, 1928 5 Sheets-Sheet 4 anww M, @ne Gus 7;, Arr 14H7 aff.

fa n /97 March 3, 1931. v Afr. HAYMAN'ET AL 1,794,685 y CRDIOLOGICAL INSTRUMENT AND METHOD Filed July 13. 1928 5 Sheets-SheetI 5 Patented' M-ar. .3, 1931 UNITED STATES PATENT ori-ICEl ARISTA T. HAYMAN AND GUY L. CAMPBELL, F ST. LOUIS, MISSOURI CARDIOLOGICAL INSTRUMENT AND METHOD Application filed July 13, 1928. Serial No. 292,370

This invention relates to the science of caring broken away to show the arrangement of diology, and to instruments and methods used the interior mechanism; in that science for the purpose of detecting, Figure 2 is a top plan view of the assembly interpreting and recording the cardiac manishown in Figure 1, portions of the cover being 5 festa-tions and variations of the human body, broken away at either end; 55

including the blood pressure' and the frequen- Figure 3 is a bottom plan View of the assemoy, strength and regularity ofthe cardiac pulbly shown in Figure 1,-portions o the bottom sations, such instruments being commonly of the casing being broken away at either end; known as sphygmometcrs, sphygmomano- Figure 4 is an end vieW ot the 'assembly l0 meters, pulsimeters and the like. shown' in Figure 1; 6o The principal object of the invention is to Figure 5 is a reverse end View of the asprovide amethod for recording cardiac movesembly of Figure 1 taken oppositely to the ments and conditions and a. relatively simple, View of Fig. 4; ei'licient and durable instrument of the kind j Figure 6 is an enlarged detail of the govstated for practising the method, and in which ernor as .embodied in Figure 1 g 65 instrument isv combined means for syncron- Figure 7 is an enlarged detail of the timously detecting, measuring and recording ing or time clotting mechanism as embodied upon a common tape or other register, both in Figure 1; the pressure of the blood stream and the fre# Figure 8 is an enlarged detail of the stop quency, strength and regularity of the heart for stopping the clock-work of the device as 70 pulsations, the said records being represented embodied in Figure 1; concurrently one over the other upon the tape Figure 9 is an enlarged detail of the diaand there being concurrently repesented upon phragm and lever elements of the sphygomor the tape a running series of timing dots, to manometer or blood pressure recording asl the end that the said records upon the tape sembly as embodied'in Figure 1; 75

may afford a combined, synchronized and Figure l0 is an enlarged detail of the sound comparative record of the diagonistic and boX or stethoscope assembly as connected with prognostic values of the cardiac manifestathe actuating lever .of the pulsimeter, as eintions referred to. The instrument also inbOdied in Figure 1; g g cludes in combination a stethoscope attach- Flglll@ l 1S 21 P1213 View 0f an luustatlfe 80 ment for the pulsimeter element. Specimen Qf TeCOdlne-S tfpe as empoyed' ln Another obje@ is to provide a Combined inthe embodiment of the invention shown in strument adapted for synchronously measui-v Plz-eure l, the?? bemg represented upon the E ing and recording the blood pressure of a tapehe mafkmgs made by the reco'dmg "Y human body, the cardiac pulsations or pulse Penclls 0f the Sphygmomanomete, PulSl- 85 action, and the time intervals intervening bemiller and um@ deleten tween the several pulse beats. e e lgure l2 1S a Slee Vlew partly te Seetten A further Object is to provideupon a Colm of another embodiment of the invention,

ding mon ta e or re ister an ultimate com lete and Wherem two Pulslmeter levers eed reeor 40 synchrlenized omparative recoiid of the pathetytuses are employed feereeerdleg the Pulse 9e ologcal Conditions of the cardiac System as action at two several radial arteries, in combination with a similar spliygmomanometer ilalmeeted by the bleed pressure and .heart assembly, all of said elementsbeing pneumatilu sa ions.

cally operated'. Wlth these and other Oblects m WGW, as W1 Figure 13 is7 a sectional detail on the line 95 aPPM ln the COUTS@ 0f this SPeCC-ationa at 13-13 of Figure 12showing the diaphragm tention is' called /to the accompanying dlaW- and leverA assembly of one of the levers shown ings, wherein in Figure l; i

Figure 1 is a side elevation of one embodi- Figure 14 is a plan yiew, partly 1 11 secment of the invention, portions of the case betion, of another embodiment of the inven- 100 tion wherein light-bulbs are oscillated pneumatically for focusing rays of light upon a sensitized film for photographically making the pulse Wave record and the blood pressure Wave 'record upon the film. A stationary timing bulb simultaneously makes the timing marks upon the margin of the same film.

Figure 15 is a side elevation of the embodiment shown in Figure 14;

Figure 16 is a detail' of a form of light shutter employed in the structure shown in Figures 14 and 15;

Figure 17 is a diagrammatical View of another embodiment of the invention, Wherein are combined a standard form of magnetically operated pulsimeter, and a pneumatically operated sphygmomanometer, the same carrying light bulbs Whose fiuctuations, as Well as the interrupted rays ot' the timing liulb, are photographically recorded-upon the Figure 18 is a side elevation of the elements represented in Figure 17 properly assembled;

Figure'19 is a plan View of the embodiment shown in Figures 17 and 18;

Figure 20 is a plan View of an illustrative specimen of recording tape as employed in the embodiment of the invention shown in Figure 12, there being represented upon the tape the markings made by the two pulsimeter styluses, the sphygmomanometer stylus and the timedotter stylus;

Figure 21 is a plan View of an illustrative specimen of the sensitized recording lilm used in the embodiment of the invention shown in Figures 17, 18, 19, there being photographical'ly represented thereupon the markings made by the magnetically operated pulsimeter, the pneumatically operated sphygmomanometer and the time dotter;

Figure 22 is a detail of a form of ink stylus adaptable for use with several'of the i described embodiments of this invention.

Vso

In the first of the illustrative embodiments of thel invention as shown in Figures 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, a suitable rectangular case 1 is provided, consisting of side plates 2 and 3 held together in spaced relation by spacing pins 4, a bottom plate, 5 havingv a lever slot 6, an end plate 7 and a removable top plate 8. The end 9 of the case opposite tothe end plate or end 7 is left open, but is adapted to be normally closed by a removable tape roll holder 10, which in effect, when mountedin place, forms a continuation of the case 1, as it is open at the end 11 connecting with the open end 9 of the case 1, but is closed at the other end 12, at the sides 13 and 14, at the top 15 and bottom 16. For the purpose of removably connecting the tape holder 10 with the case 1, the ends 'of the side plates 2 and 3 of thecase are inset at the open end 9 as shown at 17 and tabs 18 are extended from medial points of the side plates out over the inset ends thereof, thus providing clefts 19 into which the margins 20 of the sides 13 and 14 of the holder 10 lnay be inserted. Set screws 21 are then passed through the tabs 19 and the margins 20, and are lhreadedly seated in the inset ends 17 of the plates 2 and 3. A Winding spindle 22 is journaled transversely through the case 1 and a Winding knob 23 is rigidly mounted upon an outer extended end thereof.

A main drive gear 24v and attached spring drum 25 are journalcd upon the spindle 22.

A flat, spiral drive spring 26 is mounted.

Within the drum 25the inner end of the spring being secured to the spindle 22, While the outer end is secured to the periphery of the drum 25. A peripheral ratch 27 is formed upon the outer end of thedrum 25 and a paWl 28 engages this ratch, the pawl being pivotally supported upon an adjacent spindle 29 to be later again referred to.

The ratch 27 and paWl 28 are so arranged Way that the spring 26 may be readily Wound up and when Wound the driving power thereof will be transmitted to the gear 24, in a conventional manner.

- Within the lower portion of the tape roll holder 10 is arranged a bracket 32, the spaced, resilient arms 33 of which releasably support a roll carrier rod 34 upon Which is mounted a tape roll 35. Medially through the holder 10 is passed a spindle 36 upon which is rotatably mounted a friction roll 37. The tape 35 is trained up over the roll 37, at the outer side of the roll, and an idler roll 38 upon a spindle -39 supported between the sides of the holder 10, bears upon the-traveling tape and acts to hold it snugly against the roll 37. After passing over the roll 37 the tape is led down and out through a tape slot 43 inthe outer face of the holder 10. A friction drive spool 40 and a pinion 41/I are rigidly mounted upon a spindle 42 journaled at its` ends in the sides of the case 1 at the open end 9 thereof, and so that the spool 40 will frictionally bear upon the roll 37 and the tape 35 as the latter passes thereinbetween. The drive gear 24 is connected' with the pinion 41 through an intermediate speed augmenting gear 44 and pinion 45 rigidly mounted upon a spindle 46 journaled in the sides of the case 1. The gear 44 is placed in mesh with the pinion 41 and the gear 24 is placed in mesh with the pinion 45, and thus the driving power of the spring 26 is transmitted to the drive spool 40 in an increased speed ratio. The spring 26 is, of course, so placed within artery or in any desired location.

' scribed will nally rotate thespool 40 so as to force the tape down and out through the slot 43. Any conventional form of speed governor 47 is mounted in the case-loppositely to the mechanism `already described, and may be supported upon a spindle 48- journaled in the sides of the case. Upon the spindle 48 is mounted a. pinion 49 which is connected with the drive gear 24 through a train of speed augmenting gears and pinions 50 assembled upon spindles 51 journaled in the sides of the case 1, all in a well known manner. A stop pin 144 is j ournale'd through L and 3 of the case 1 are extended downwardlyl at the under side of the case and at the open end 9 thereof, as shown aty 52, and an upwardly convexe-d base plate 53 is mounted at the lower extremity of the extensions 52. Two strap supporting rods 54 connectvthe lower outer corners of the extensions 52 transversely of the case 1. Two outwardly curved metal pulsimeter straps 55, formed into hooks 56 at one end for releasably engaging the rods 54, are provided, and these straps are joined by a flexible contact element 57 which is secured at its ends 58 to the upper ends of the said metal straps 55. A plurality of lacing hooks 59 line the margins of the lower, adjacent ends of the straps 55, and a cor-d lace 60 passed back and forth behind these hooks, after the manner of lacing a shoe, aords means for securing the instrument as a whole upon 'the wrist or arm of a patient immediately over some radial A conventional form of air pressure bag 61 is fastened at one end 62 to the lower inner mar- 65 for sustaining the inflation 'of the bag 61 as may be required. A circular aperture 67 is formed through the base plate 53, and a flat, circular and hollow sound box 68 is loosely seated therethrough and adapted to bear upon the flexible element 57. A bearing pin 69 is extended transversely between and connects the-two lower, outer corners of the extensions 52 of the plates 2 and 3. The box 68 is hingedly secured to this pin by means of a .link 70 extended from the box and having its outer end loosely engaging the pin 69 which passes through that end. A pulsimeter actuating lever 71 having a forked or bifurcated end portion 72, the extremities of which are connected by an end lug 73, is hingedly mounted by the said lug 73 to the pin 69 by loosely passingr the latter through the lower margin of the former, the

said lug 73 being formed with a recess 74 adapted to accommodate the outer end of the link 70.

A curved pressure shoe 75 is loosely pinned by a pin 76 inside the forks of the bifurcated end 72 of the lever 71, the said shoe being adapted to bear down upon the upper face of the box 68. A link 77 is provided, the same having a bifurcated end embracing the shoe 75 and being loosely pinned to the said shoe through the split end of the link by a pin 78.

yThe outer end of the link 77 is tapped longitudinally to engage an adjustment screw 79,

the shank of which is journaled at 8O through the end lug 73 of the lever 71, and ends in an outer knurled head 81. Stops 82 are secured to the shank of the screw 79 ateach side of the lug 7 3 to prevent longitudinal movement of the screw relative to the lug 73. Thus by turning the screw 79 into or out of the link 77, the shoe 75 may be caused to press down upon the boxl 68, or such pressure may be re.- moved from the box, as desired, the said box being in turn forced down into or withdrawn from the flexible element 57: and it will be noted that the shoe 75 is thus braced between the lever 71 above, and the box 68 below. The utility of the arrangement of these elements as described and assembled, and the function and purpose of the pressure shoe 75 relative to the box 68, will be shown later.

The free end -of the lever 71 is extended towards the opposite end of the case 1 along. and through the lever slot 6, and is forked as shown at 83. This forked end embraces thefpangularly bent finger 84 of a bell crank leyer 85 which is fulcrumed upon a pin 86V. Apassed through a bracket 87 extended inwardly from the side plate 2 of the case 1. The otheriinger 88 of the lever 85 is extended through the case 1 perpendicularly to the top and bottom thereof and ends in the forked extremity 90. Thus the lever 71 is adapted to oscillate in a planegparallel with the plate 2, while the lever 85 is adaptedto oscillate in a plane perpendicular to the plate 2, and parallel with the end plate 7. An adjustment screw 89 is passed loosely through the opposite side plate 3 in transverse alignment with the free, forked extremity 90 of the lever 85. @ne end of a tension spring 91 is fastened to the inner end of the screw 89 and the opposite end of the spring is secured to the exy tremity 90 of the lever 85. A knurled nut 92 at the outer end of the screw 89 affords means for adjusting the tension of the spring 91, thereby increasing or decreasing the pull of the -spring 91 upon the lever 85. The normal action of the spring 91 is to draw the lever 85 over towards the side 3 of the case 1.

A pulsimeter recording lever 94 is eXtended longitudinally through the top portion of the case 1 from the closed end 7 out throu h the open end 9 thereof. The inner end oft e lever 94 is passed through the forked end 90 of the lever 85 and is pivoted by a pin 96 within a bracket 97 upon the side plate 2, in such a manner as to adapt this lever to oscillate in a plane parallel with the top plate 8. The outer free end of the lever 94 carries a conventional form of marking or tracing stylus 98 which bears upon the tape 35 as the same passes over the roll 37 and makes a tracing upon the said tape as it travels. One adaptable form of such stylus' is to provide an ink holding recess 99 in the stylus with a small aperture 100 leading therefrom down to the tape 35. The normal action of the spring 91 is to draw the stylus 98 over towards that margin of the tape 35 adjacent the side 14 of the tape holder 10, while the inward movement of the lever 71, brought about by the outward pressure of the box 68 upon the shoe 7 5, tends to push the stylus 98,

over towards the opposite margin of the tape 35, through the action of the bell crank lever 85 upon the lever 94, as described. A leX-" ible air tube 102 is connected to and communicates interiorly with the sound box 68 and this tube is branched as shown at 103, the branches being connected with conventional ear phones (not shown), andthe said assembly of box, tubes and phone constitute a form of stethoscope to enable the physician to listen in to the operation of the instrument as inlincnced by the pulse or heart beats of his patient, while the entire assembly so far described may be collectively referred to as the pulsimeter assembly.

A circular aperture is cutA through the side plate 3 at a medial point, and a lcircular, disk-like diaphragm case 105 having one side open is provided and mounted over this aperture with the open side of the case in register with the plate aperture, and within the said case is arranged a circular, resilient diaphragm 106, the periphery of the diaphragm being sealed tothe inner periphery of the case in an air-tight manner. A nipple 107 is connected with the outer side of the case 105 and communicates with the interior of the case at the outer face lof the diaphragm 106. A lever pin 108 connects with and extends from the inner face of the said diaphragm inwardly of the` case 1 through the said aperture in the plate 3. A sphygmomanometer lever 109 has its inner end pivoted within a bracket 110 extended from the plate 3, by means of a pin 111, the free outer end of the lever 109 beinnr extended out through the open end '9 of the case 1 and ending in a stylus 112 similar to the stylus 98 of the lever 94, and bearing in like manner upon the tape 35 as the same passes over the' with one another in their lateral movement,

one lever and stylus.l as 109-112, is disposed somewhat below the other lever and stylus 94-98, as shown in the drawing. An adjustment screw 113 is passed loosely through the plate 3 in alignment with the lever 109 and the inner end'ofthis screw is secured to a retractile coil spring 114 having its inner end fastened to the lever 109. A nut 115 threadedly enga ges the outer end of the screw 1-13 and affords means of adjusting the tension of the spring 114. This screw and spring are adapted to normally draw the lever 109 over towards the side 3 of the case, although allowing it to be resiliently forced towards the opposite side.

A flexible inflation tube 116 connects with the nipple 107 and ends in|an elastic air pressure bulb 117, equipped with the screw valve 118. A conventional form of pneumatic tourniquet 119 is provided for strapping around 'the arm for temporarily stopping the flow of blood through an artery, in the process of calculating the blood pressure, and this-tourniquet connects' through a branch tube 120 with the tube 116. Pressure upon the bulb 117 will both inflate the tourniquet 119 and will simultaneously force the diaphragm 106, lever 109 and stylus 112 inwardly against the action of the spring 114. The assembly last described may be collectively referred to as the sphygmomanometer assembly.

A time dotter mechanism designated generally by the numeral 121 is supported within the case 1 at the inner side of the plate 2. 'In the embodiment shown, this mechanism includes a driving assembly of gear wheel 122 and attached spring drum 123 journaled upon a spindle 124. Thevv outer end of the spindle isjournaled through the plate 2 and ends in the winding knob 125. The inner end of the spindle is journaled in the bracket 1h26 mounted upon the inner side of the plate4v2. A ratchet 127 is rigidly mounted upon the inr er end of the spindle. A pawl 128 is pivoted z t 129 upon the inner face of the drum and engages the ratchet 127. Another pawl 130 is pivoted at 131 tothe bracket 126 and engz. ges a peripheral ratchet 132 carried by the drum 123. A clock spring 133 is coiled within the drum 123, having its ends attached to the periphery of the drum and to the spindle 124.. A.conventional vform of clock escapement 134 is mounted upon the inner side of the plate 2 in longitudinal alignment with the elements last described, the escapement wheel 135 carrying a pinion 136 and being rotatably pinned at 137 to the plate 2. The oscillating pallet 138 of this escapement is provided with a projecting lever striking lug 139. An intermediate gear wheel 140 is rotatably pinned to the plate 2 and is placed in mesh with the gear wheel 122 on the one side and the pinion 135 on the other side, thereby transmitting the drive action of the spring 133 to the escapement 134. A rotatable stop pin 142 is journaled through the plate 2, its inner end carrying `a cam 143 adapted to impinge the gear 140 upon the turning of the pin, thereby stopping the mechanism 121, as may be desirable.

A time dotter lever 146 is longitudinally mounted through the ope-n end 9 of the case 1, adjacent to the plate 2 and in parallelism with the levers 94 and 109. T he inner end of the lever 146 is loosely pinned at 147 within a bracket 148 upon the plate 2 in such manne-r that the lever may oscillate or vibrate in a plane parallel with the plate 2, but may not move laterally as dothe levers 94 and 109, as described.- The outer end of the lever 146 carries also a' marking stylus 149 similar to the styluses 98 and 112 of the levers 94 and 109. rllhe lever 146 is thus arranged adjacent the' side plate 2 and its stylus 149 is adapted to vibrate or oscillate perpendicularly to the tape 35 as'same passes over the roll 37, impinging that tape and making a time interval dot at that margin of the tape at each vibration of the stylus 149. The lever 146 is made to vibrate by the striking lug 139, which is adapted to strike or impinge the lever 146 at each cyclic movement of the pallet 138 as caused by the spring 133 and gear train described. Thus each cyclic movement of the pallet 138 results in a time dot being made upon the traveling tape 35 synchronously with the markings made by the other two levers 94 and 109 through their styluses 98 and 112.

The lever 146 being disposed over at the side of the case 1, that lever as well as stylus 149, is outside the path of lateral swing of the levers 94and 109,'and thus there is no danger of interference; but the lever 146 may be mounted somewhat above the levers 94 and 109 as shown, as an additional safeguard against such interference. In order that the several styluses, 98, 112 and 149, may not interfere with one another, their points of contact with the tape 35 upon `the roll 37 are arranged in dilferent radial planes passing through the axis of the said roll 37, as shown in the drawing. The assembly of elements last described may be referred to collectively as the time flotter assembly.

ln the use of he invention inthe embodiment just shown, the case 1 isstrapped upon the patient by locating the/contact element 57 of the pulsimeter assembly immediately over the radial artery within the pit of the elbow, and with the sound box 68 oi the pulsimeter assembly resting upon the element 57 over this artery. The tourniquet 119 of the sphygmomanometer assembly is then strappedaround the arm just above the elbow, in the usual manner. The pulsimeter air bag 61 is then inliated, and the adjustmentscrew 81, which controls the pressure of the shoe upon the box 68, is turned in or out as may be required to properly adjust the box 68 in snug lcontact with the artery. The mechanisms are then set in operation by releasing the two stops 142 and 144, which of course starts the tape`35 movingover the roll 37 and out through the slot 43 in the end of the case l, and also starts the time dotter stylus 149 tapping the strip of tape 35 as it travels, thereby mark-ing along that margin of the tape an equi-spaced series of dots 150 representing regular time intervals between the dots. with the tube 102 upon his ears, the physician now gradually inilates the tourniquet 119. As the tape 35 travels there will nowbe synchronously traced thereupon, three individual but coordinated and synchronized sets or' markings or tracings, to-wit; the time dots 150 made by thestylus 149, the pulse wave-line or tracing 151 made by the pulsimeter stylus 98, and the blood pressure wave lNith the head-phones connected line or tracing 152 made by the sphygmoor released by the hand' of the physician. It

will be noted that the two sets of wave-lines represented by the tracings 151 and 152 may and frequently do\cross and recross` one another in the practical use of the instrument.

lt will also be noted that the styluses 149, 98 and 112 contact with the tape 35 upon the roll 37 in a stepped sort of order, one following the other in the order named, and that their respective markings 150, 151 and 152, would therefore of course stand in the same relation; rlhe physician will take this fact into consideration in reading and interpreting the combined system of markings. This stepped arrangement of the said markings is not necessary per se, however, but results of mechanical necessity with the embodiment and assembly as just described. The physician thus is provided with a combined and synchronized comparative record,

l the other and each by or with reference to the series of time dots upon the margin of the tape. Also with his earphones in place, the

' physician may listen in to the sibilations,

transmitted through the sound box 68, of the pulsating blood stream passing through the arteries under variations of pressure of the tourniquet, and he is enabled to interpret the pathological meaning of these sounds in connection with the other manifestations and records of the instrument.

In another or second embodiment of the invention as illustrated in Figures `12 and 13, in combination with the sphygmomanometer lever 109a, tWo pulsimeter levers 94a and 946 are employed instead of only the one as shown at 94 in the first described embodiment, these levers carrying styluses F112e, 98a, and 986, all bearing` upon the tape passing over the roll 37, the said roll being actuated and controlled by clock mechanisms and gears 24`40-.44 and l17--50 as shown in the first described embodiment. These several levers are all operated pneumatically, being provided with bell crank shafts 155 fulcrumed at 156 to brackets 157 extended from the case 1.- Circular diaphragm recesses 158 are formed in the end plate 7 of the case 1,

- and communicating nipples 159 extend from l nism 121a,

' the these recesses. Circular diaphragms 160 are mounted over the open sides of the lrecesses 158 with sealed joints.` Lever pins 161 then connect these dialphragms with the bell cranks 155, being oosely pinned thereto at 162. The same form of'time dotter mechaincluding a lever 146e and stylus 149e is provided for this embodiment as for first described embodiment of the invention. Flexible air tubes 163 extend from the nipples 159 to a conventional form of pneumatic tourniquet (not here shown but similar to the element 119 shown in Figure 2 of the first described embodiment) These tourniquets are adapted for attaching to the person ofi the patient upon the wrist, arm, leg or throat, as the physician may desire. When inflated, the air pressure from the .tourniquet with which is connected the sphygmomanometer lever 109a, operates to laterally deiect that lever and to make upon the tape 35 a wave-line tracing similar to that shown at 152 in Figure 11, in the description ofthe lirst embodiment, while the other two tourniquets, being located over radial arteries, transmit pneumatically the pulsations thereof through 'the air/tubes 163 to the levers 94a, 946 and styluses 98a, 986, thereby synchronously making two corresponding pulse-wave tracings upon the tape 35, similarA to that shown at' 151 in Figure 11. synchronously the time dotter mechanism 121e makes its regular series of time dots along the margin ot' the tape, and which dots are similar kto the dots shown-at 15() in Figure 11, as designated and described relative to the first embodiment of the invention. Through theuse of two pulsimeter levers and styluses, the

physician is enabled to take readings andl records from two separate radial arteries simultaneously, for thepurposes of comparison.

- In another, or third embodiment of the invention illustrated in Figures 14, 15, 16, two pneumatically operated diaph'ragms 160 and lever assemblies 155-161 are employed and arranged side by side at theend 7 of the case 1, these assemblies being operated in manner identical with that described in reference to the second described embodiment of the invention illustrated in Figures 12 and 13. But in lieu of the mechanical levers 946, 1090 and styluses 986, 112e, as there employed, small light bulbs 165 are used, the same being seated within sconces 174 mounted at the free ends of the bell cranks 155 and thereby being adapted to oscillate laterally as these levers 155 are moved under the impulses of the diaphragms 160. The rays from the bulbs 165 pass out through apertures 95 inthe sconces and^thence through focusing lenses 166 mounted in proper alignment and spaced relation between the bulbs 165 and a hollow, cylindrical shutter 167 upon the spindle 93 journaled transversely at the open end 9 of the case 1, closely over the 4windowslot 168 of a camera 10a which is extended at that end of the case, being in fact a substitution for the tape roll holder 10 of the irst described embodiment herein. The shutter 167 is provided with a `plurality of elongated light slots 170, which upon the vrotation of the shutter, intermittently admit light rays from the bulbs 165 into the camera 10a. The shutter 167 is rotated by governor controlled clock mechanism 50a, similar to the mechanism 50 of the first described embodiment herein'. A roll of photographically sensitized film 35a is rotatively mounted in the lower part of the camera 10a upon the roll 36a journaled in the sides of the camera, and is trained over rollers 169 across the Window slot 168 and thence is rewound upon a roll 171 upon a spindle 172 journaled in the sides of the camera. The roll 171 is rotated by a governor controlled spring actuated clock mechanism 506 supported upon spindles journaled in the sides of thel camera 10a, as shown, and including an intermeshing gear markings 151e and 152@ representing and 174@ and lens 166@ located at one-side and so as to throw its rays through the shutter 167 upon the margin of the film 35@, thereby reproducing time markings 150e. Inasmuch as the shutter 167 rotates with a constant speed, the time marks 150@ Would be equispaced and would represent equal intervening time intervals. @t course the lateral oscillations of the other bulbs 165 Would be limited so as to not interfere or mingle with the time marks. 1n this assembly either of the light bulbs 165 may be employed to photographically record the arterial pulsations, as may be desired, and the other bulb to record the blood pressure fluctuations.

In another, or fourth embodiment of the invention shown in Figures 17, 18, 19, the

' pneumatically operated light bulb- 165 of the pulsimeter assembly which registers .upon the film 35a the pulse fiu'ctuations, is replaced by a small magnetically oscillated mirror 17 5 attached to a small iron vane 176 which is suspended Within a cell 177 of clear oil of the requisite viscosity. This vane 176 is oscillated by two solenoidal coils 178 so placed that the amplied body current from the patient passing through the coils varies the magnetic field, thereby causing the vane 176 and mirror 175 to oscillate or shift laterally.

The fluctuations of' the mirror are then recorded upon the film 35a by a ray from a ysmall light bulb 165?) passed through a lens 166?) to the mirror and back into the camera 10b. In this arrangement the current is led from the Contact element (not shown) properly located over a radial or pulsating artery through leads 17 9 and passed through an amplifying system 180 similar to those used in radio receivers. No invention is claimed for this described method of current amplification, or magnetic control of the mirror, or method of projecting the light ray from the mirror ont-o the film, except only as the same is drawn into combination with the other elements of this embodiment now to be pointed out. These other elements include ai pneu- -matically operated sphygmomanometer as` sembly similar to the corresponding structures shown in Figures 111, 15 and 16 of the third described embodiment, and consisting of 'alight bulb 165 Within its sconce 174, the latter being mounted at the end of the bell crank'l which is in turn operated by the diaphragm 160 and lever pin 161. Similarly,

a timing bulb 165a is'provided. The rays from the bulbs 165 and 165@ are projected through the shutter 167 into the camera` 10b,

and a timer, the movements of the threel ele` ments being synchronously and photographically recorded upon a film.

rThose several embodiments and combinations ot physical and mechanical principles and elements have here been shown and described as means for utilizing and carrying out the proposed method of synchronously detecting, interpreting and 'recording the various cardiac phenomena. of the human bo'dy,`as conventionally attended to by physiciansff @ther devices and combinations might also be employed, orIvariations made from the specific structures here shown, Without departing from the spirit of the invention, as defined in the appended claims.-

-We claim:

1. In an instrument of the kind described, a frame, a stethoscopic soundbox hingedly mounted in the frame for bodily movement and adapted to be actuated by contact with a radial artery, and recording means provided With a pressure shoe and bearing against the stethoscopic sound box and adjustable to regulate the pressure and actuated by the stethoscopic sound box for\operating the recording means.

2. In an instrument'ot the kind described, a frame, pulsimeter straps connected With the frame at spaced points, a stethoscopic sound box mounted in the frame for bodily movement between the points of attachment With the pulsimeter straps, recording means actuated'byth'e stethoscopic sound box and provided with a pivoted pressure shoe bearing against the stethoscopic sound box and adjustable to vary the pressure.

3. In an instrument of the kind described, a frame, pulsimeter straps connected to the frame at spaced points, a flexible contact element located between the attached portions of the pulsimeter straps and having an aperture, a bodily movable stethoscopic sound box operating through the aperture, and recording means actuated by the bodily movement of the stethoscopic sound box.

4. In aninstrument of the kind described, a frame, pulsimeter straps connected to the frame at spaced points, a flexible contact element located between the attached portions of the pulsimeter straps and having an aperture, a bodily movable stethoscopic sound box llG operating through the aperture, recording means actuated by the bodily movement of the stethoscopic sound box, and including a lever having a pivotal connection with the stethoscopic sound box, a pressure-'shoe carried bythe lever and bearing against the 'stethosc'opic sound box, and an ladjusting screw mounted on the lever and connected With the pressure shoe. lo 5. Inv an instrument of the kind described, a frame, pulsilneter straps attached to the frame at spaced points, a flexibleplate connecting the attached portions of the straps and provided with an aperture, a stethoscopic sound box operating through the aperture of the contact plate, and recording means actuated by the stethoscopic sound box and including a lever movably connected with the stethoscopic sound box and provided with adjustable pressure means for engaging the stetho- 1. scopiosound boX at a point spaced from the point of connection of the lever and the stethoscopic sound box.

ARISTA T. HAYMAN, M. D. GUY L. CAMPBELL. 

